Improvement in steam-valves



RUFUS B. CHAPMAN AND E. FRANK SPAULDING, OF CAMBRIDGEPORT, MASSACHUSETTS.

IMPROVEMENT IN STEAM-VALVES.

Specification forming part of Letters Patent No. 122,566, dated January 9, 1872.

To all to whom these presents may come:

Be it known that we, Burns B. CHAPMAN and E. FRANK SPAULDING, of Oamhridgeport, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Valves; and do hereby declare the same to be fully described in the following specification, and represented in the accompanying drawing, of which- Figure 1 denotes aside elevation, and Fig. 2 a central and vertical section of a valve constructed in accordance with our invention.

The object of our invention is to produce a simple, cheap, and effective valve for water, steam, gas, Suc.; and consists, first, in a peculiar construction of the valve-plug and the shell, whereby the former while being moved on and off its seat is not only so guided and maintained against the face of the seat as to keep the latter clean or free from dirt, but when forced down upon such seat to effect a perfectly-tight connection therewith; and second, in a novel method of locking or afxing the seat to the shell of the valve.

In the drawing, A denotes the body of the i valve, through which a straight, unobstructed passage for the owage of water, steam, Svc., is made. B is the valve-stem, which is provided with a hand-wheel, C, at its upper end. D is an annular shoulderv formed on the said stem, the same resting upon the bottom of a chamber, a., made in the top of a cap, E,which is screwed upon the neck of the valve-case. F is a collar or tubular guide, whose lower end is screwed into the chamber a, and forms a bearing for the said shoulder, which, thus con fined, prevents the stem from having any longitudinal movement, and limits it to a simple rotation upon its axis. The said collar is surmounted by a stufflngbox or cap, Gr, which is screwed thereon. The lower end of said stem is formed with a male screw which works in a corresponding female screw made vertically through the plug H, which is a flat block with parallel faces, so formed and applied to its chamber as to have its front face slide in contact with the seat I, and thereby serve to keep such face clear of dirt or obstructing matter. In order to preserve the disk or plug in contact with the face of the valve-seat, the rear face of such plug is formed at its upper end with a projecting lip or incline, b, which during the upward and downward movement of the plug` bears against the inner face of the neck of the case or shell, and thus serves to maintain the desired contact. The said plug is also formed with aretreatin g incline or bevel, c, on the lower part of its outer face. The said two inclines b c, operating respectively against corresponding inclines d e formed on the inner face of the shell or body, as seen in Fig. 2, serve to force the plug, when the same is screwed downward, with any desired degree of force against its seat. So also the valveface may be connected to its disk in like manner, by forming a dovetail or other propershaped groove around the edge of the disk, and making a corresponding rib on the under side ofthe face, and uniting the two by pouring into the said groove any solder or molten metal that will harden and firmly unite them.

The next part of our invention is the mode of affixing the valve-seat to the body ofthe valve. In carrying out this part of our invention, as shown in the drawing, we cast the body or shell ofthe valve of iron or other metal, and the seat thereof of bra-ss, forming an annular dovetailed or other suitable recess, f, in the body to receive a corresponding rib or dovetail, g, made on the rear face of the seat,

as shown in Fig. 2. The seat having been smoothed or finishedf is to be placed in its proper position in the shell, and by means of solder or molten metal, poured into an opening, l1., formed in the shell, and leading into the annular recess f, the seat is securely iixed or locked to the shell. Another mode in which we have contemplated securing or locking the seat to the body or shell is to cast the seat with an annular dovetail or rib, as before mentioned. Next place such seat in the mold to form the shell, and next cast the molten metal to form the shell around it, whereby it will be firmly embedded or afxedto the same.

l/Ve do not claim forming the faces of valves and valve-seats of brass or Babbitt metal, by casting such faces upon cast-iron valves and seats, having grooves and rivet-holes to form a secure fastening between the two metals, as we are aware that such is not new. We cast the faces of the valves and seats indepen dently, and having planed or iinished them,

unite such to their cast-iron bodies by means of solder; therefore What We claim is- 1. A valve-seat or valve-disk, formed as described, and looked or secured to its shell or base, constructed as set forth, by means of solder or any molten metal that Will harden and unite the two as specified.

2. A valve, having its plug and shell formed as described, viz., the plug with parallel faces and inclines b c, and the shell with the inelines d e, the Whole being arranged and operating together in manner as set forth.

RUFUS B. CHAPMAN. E. FRANK SPAULDING. Witnesses:

F. P. HALE, F. C. HALE. 

